Superconducting magnet and its quench protection device, method, and magnetic resonance imaging system using the superconducting magnet
A technology for superconducting magnets and quench protection, applied in superconducting magnets/coils, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as cold burns, loss of cryogenic liquids, injuries, etc., to prevent Effects of cold burn and saving cryogenic liquid
Active Publication Date: 2018-05-18
SIEMENS SHENZHEN MAGNETIC RESONANCE
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Problems solved by technology
When the switch is pressed, current flows through the heater to heat the heater and conduct the heat to the superconducting coil immersed in the cryogenic liquid, causing an emergency quench of the MRI system
However, in the existing quench device, if no one restores the switch to the normal position (i.e. the non-activated position) after the switch is pressed, the switch will always be in the activated position
This will cause the heater to be in a heating state to continuously generate heat, which will cause the temperature of the superconducting coil to rise, causing the cryogenic liquid to vaporize rapidly and lose a significant amount of cryogenic liquid, resulting in an increase in cost
In addition, the temperature of the vaporized cryogenic liquid is still low, which may cause harm to those who come into contact with it, such as cold burns or even suffocation.
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[0051] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0052] figure 1 Shown is a schematic diagram of a superconducting magnet 100 in an embodiment of the present invention. Such asfigure 1 As shown in , the superconducting magnet 100 includes a cryostat 110, a plurality of superconducting coils 112-115, a plurality of heaters 116-119, a power supply device 120, an emergency quench switch 130, a monitoring unit 140, An alarm unit 150 . It should be noted that the superconducting magnet 100 also includes other features, such as electrical connections, mechanical supports, etc., which are not shown in the drawings for...
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The invention discloses a quench protection device for a superconducting magnet. The quench protection device for a superconducting magnet includes an emergency quench switch, a monitoring unit and an alarm unit; The state of the quench switch sends a prompt instruction to the alarm unit; the alarm unit is used to send an alarm signal according to the prompt instruction. The invention also discloses a quench protection method for a superconducting magnet, comprising: S1: sending a prompt command to an alarm unit according to the state of an emergency quench switch; S2: the alarm unit sending a prompt command according to the prompt command Alarm. The invention also discloses a superconducting magnet using the quench protection device and a magnetic resonance imaging system using the superconducting magnet.
Description
technical field [0001] The invention relates to medical imaging equipment, in particular to a superconducting magnet applicable to magnetic resonance imaging (MRI), its quench protection device and method, and a magnetic resonance imaging system using the superconducting magnet. Background technique [0002] The magnet is the core component in the magnetic resonance imaging (MRI) system, which can provide the required magnetic field environment for imaging. Currently, superconducting magnets in MRI systems are capable of producing magnetic fields with good uniformity and high stability. Under normal circumstances, when the field is intentionally removed to achieve repair, maintenance or change operation requirements, it is usually through a controlled ramp-down to remove the field, but this method of removing the field takes a period of time and requires appropriate effective control. In the event of an emergency, such as when the magnetic field needs to be switched off to ...
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IPC IPC(8): H02H5/00H01F6/00G01R33/3815
Inventor 方志春
Owner SIEMENS SHENZHEN MAGNETIC RESONANCE